Blimp Client: add support for tap gesture events

blimp/engine/session/blimp_engine_session.cc

Index: blimp/engine/session/blimp_engine_session.cc
diff --git a/blimp/engine/session/blimp_engine_session.cc b/blimp/engine/session/blimp_engine_session.cc
index 037f3e809d30393841b0a99c16204d2f07593f35..60297171e4d31bb04d4aba86390295c1e340914b 100644
--- a/blimp/engine/session/blimp_engine_session.cc
+++ b/blimp/engine/session/blimp_engine_session.cc
@@ -388,8 +388,8 @@ void BlimpEngineSession::Reload(const int target_tab_id) {
 void BlimpEngineSession::OnWebGestureEvent(
     content::RenderWidgetHost* render_widget_host,
     std::unique_ptr<blink::WebGestureEvent> event) {
-  TRACE_EVENT0("blimp", "BlimpEngineSession::OnWebGestureEvent");
-
+  TRACE_EVENT1("blimp", "BlimpEngineSession::OnWebGestureEvent", "type",
+               event->type);
   render_widget_host->ForwardGestureEvent(*event);
 }